That's messed up... The reason is that the names of those menu items are suppose to be in the phrase manager but are not. That menu is in your header template. The variable names are in that menu as $phrase[vb_members_list] etc. If you search for this variable in the phrase manager, it won't exist, thought members_list might. In any event, you need to add the missing phrases or fix the ones that are incorrectly named.
Here is a quick fix for members list... add a new phrase to the phrase manager.
Phrase Type global
Product vbulletin
Varname vb_members_list
Text Members List
Add it and the menu item should be fixed next to the FAQ.
Do the same thing with Quick Links and New Posts and you should be good to go